Elevator-signal.



R. H. GAYLORD.

ELEVATOR SIGNAL. APPLICATION FILED MAR. 9, 1915.

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ELEVATOR SIGNAL.

APPLICATION FILED MAR-9, 1915.

1 ,1 85,085 Patented May 30, 1916.

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ELEVATOR SIGNAL.

APPLICATION man MR. 9, ms.

Patented May 30, 1916.

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UNITED STATES PATENT OFFICE.

ROBERT E. GA'YLORD, CF PASADENA, CALIFORNIA, ASSIGNOR, BY MESNF ASSIGN- MENTS, TO I H. GAYLORD COMPANY, OF LOS ANGELES, CALIFORNIA, A CORPORA- TION OF CALIFORNIA.

ELEVATOR-SIGNAL.

Application filed March 9, 1915.

To all whom it may concern Be it known that 1, ROBERT H. GAYLORD, a citizen of the United States, residing at Pasadena, in the county of Los Angeles and State of California, have invented a new and useful Elevator-Signal, of which the following is a specification. V

This invention relates to signaling means for elevators, and the main object of the invention is to provide means whereby the operator in the elevator car may telephonically announce at the different landings, any desired information as to the direction of travel, position, destination or condition of the car.

Another object of the invention is to pro vide for limiting the telephonic communica tion to any desired number of floors in advance of the car.

A further object of the invention is to provide for selectively controlling the telephonic circuits, so that announcement may be made only at landin s from which a call has been sent. I

Another object of the invention is to provide for sel ctive signaling by a sin le signal means, in such manner that a calling passenger will be notified that his call has been received, and will be instructed as to which one of a plurality of cars will serve him.

Another object of the invention is to provide for utilization of the same circuit for calling current, under the control of the landing switches, and for telephonic communication from the car to the landings.

Another object of the invention is to provide improved means for operating the switch means for selectively controlling the communication with the landings according to the position of the car, and in this connection an important object is to provide for direct control of the motion of said switch means by the elevator signal cable, so as to eliminate all gear connections between the car sheaves and the switch and to insure correspondence between the positions of the car and switch.

Another object of the invention is to provide improved means for retaining the push buttons of an elevator signaling system in operated position, and fo resetting same to normal position when the car reaches the called floor.

Another object of the invention is to pro- Specification of Letters Patent.

Patented May 30, 1918.

Serial No. 13,120.

vide means whereby the operator in any car may prevent resetting of the push button by his call so as to hold the car for another car. and may notify the calling person of the transfer of the call to such other car.

The accompanying drawings illustrate an embodiment of my invention, and referring thereto;

Figure 1 is a plan view of the car operated switch. Fig. 2 is a front elevation of said switch, with the reversing rail thereof in section. Fig. 3 is a partly broken side elevation of said switch. Fig. 4 is a diagram of the circuit conneotions' Fig. 5 is an elevation of one of the push button dewdces, with its casing in section. Fig. 6 is a diagram of circuit connections for multiple calls at a landing. Fig. 7 is a vertical section and Fig. 8 a horizontal section of means for variably controlling the travel of the car0perated switch. Fig. 9 is a side elevation of a modified means for operating the car-operated switch. Fig. 10 is a partial plan view of the car-operated switch in neutral position. Fig. 11 is a section on line 1111 in Fig. 10.

My invention is especially adapted to a plurality of elevators in adjoining shafts, and is herein shown as applied in connection with two elevators, it being understood, however, that it is applicable to any number of elevators. Each of the elevator cars 1 is connected to operate a switch device for controlling the electric connections so as to always put the car in connection with one, two or more floors in advance. Vhile any suitable switch may be used for this purpose, I prefer to use the cable-operated switch shown in the drawing and compris ing a switch member 2 of insulating mate rial, carried by a slide 3, mounted to travel vertically in guideways 5 on a support 4, also of insulating material, said member 2 being provided with contacts 6, 7 8 and 6, 7 and 8, adapted to make connection w'th fixed contacts 9 and 9' on the support 4. Said support is made with projecting side members a in which the contacts 9 and 9 are inlaid so as to be flush with the sur face thereof. Guideways 5 are preferably formed as ball-races for balls 5 so as to minimize friction. Slide 3 is hung on a spring support or suspension 11, mounted on a fixed support 12 by adjustable connection 13 so as to properly adjust the position of the switch and the action of the spring. Said spring may be connected to a lug or bracket 14 on the slide 3, and said bracket may also be connected to one end of a signal cable 15, which hangs in the shaft and is attached at its other end to the elevator car. This signal cable is sustained at one end by the spring 11 and at its other end by the elevator car, and the tension on the spring is substantially equal to the weight of the portion of the cable between the spring and the bottom of the bend or loop at the lowest part of the cable. As the car descends, this loop or bend is lowered, with the result that more weight is brought on the spring and the slide 3 and switch member 2 are caused to move down in correspondence with the movement of the car. By this means the switch may be made to travel through 'arelatively short path of travel, in correspondence with the up and down mo tion of the car in its shaft. hiftable weights 16 may be provided on cable 15 to vary the weight in a given length, so as to compensate for variations in fioor height and give a uniform travel of slide 3 for each floor. These weights may be lead slugs pinched on to the cable. 4

Switch member 2 is mounted by pivots 17 on slide 3, so as to swing to one side or the other, and the fixed contacts 9 and 9 are arranged in two vertical series at opposite sides of the pivotal center of member 2, so that when said member is swung to one side, the contacts 6, 7 and 8 on said member will be brought in contact with fixed contacts 9 atone side, and when member 2 is swung to the other side,the contacts 6', 7 and 8 on member 2 will be brought in con; tact with the fixed contacts 9 at the other side. Springs 18 and 19 on member 2 en gage the respective contacts 6, 'l and 8, etc., so as to press them against or toward the fixed contacts, the motion of the contacts 6, 7 etc., under the action of their respective springs being limited by engagement of said springs with the member 2, so that the contacts at the side of member 2 which is moved away from the slide 3, will be held out of contact with the fixed contacts at that side, as indicated at the right of Fig. 1. Springs 18 and 19 may be formed as leaf springs having forked end portions engaging in necks 20 in the respective movable contacts. The effect of these springs on the said contacts is to tend to hold the member 2 in neutral position in which itis parallel to slide 3, and means are provided for moving and holding the member 2 positively to one side or the other, according to the direction of movement of the elevator and for permitting said member to assume its neutral position at the extreme portions of its travel. F or this purpose member 2 is provided with an arm 21 adapted to engage a rail 22 mounted on a fixed support 23, said arm bemg reversely beveled, as shown at 21,

21", at its lower and upper edges, and the rail 22 being also reversely beveled, as shown at 22, 22", so that when the arm engages one end of the rail it will be swung to one side, and when it engages the other end of the rail it will be swung to the other side, and when the slide 3 approaches the end of its travel, for example during the passage of the el vator car through the last story in going in either direction, the arm 21 will pass olf of the rail 22 and member 2 will swing to neutral position under the action of springs 18 and 19.

Contacts 6, 7, 8 and 6, 7 and 8 are of such length that when the switch member 2 is in neutral position shown in F 10, all of said contacts will bear on the fixed con tacts 9 and 9 or on their supporting means 4, and all of the springs 18 and 19 will'be bent somewhat, so as to press on all the contacts and hold the switch member 2 in neutral position, the action of the springs being balanced at opposite sides. This position is only taken when the switch member 2 is at the upper or lower end of its travel. When the switch member 2 is in its uppermost position the arm 21 thereon will extend directly above the upper end of the rail 22, as shown in Figs. 10 and 11, so that when said switch member descends, the lower beveled face 21 on arm 21 will engage the upper beveled face 22 on rail 22, so as to cause the arm to ride to one side of said rail, thereby swinging switch member 2 so that the contacts 6, 7 and 8 are removed from the contacts 9 (the springs 18 and 19 for said contacts 6, 7 and 8 then lying flat on switch member 2, whereby the said contacts are caused to move bodily with said i switch member) while the contacts 6, 7 and 8 are still held against the contacts 9 or the support 4? therefor. Similarly, in moving 'upward from its lowermost position,the arm 21 engages by its upper beveled face 21 with the lower beveled face 22' of the rail 22, so as to swing the switch member 2 to position shown in Fig. 1, removing the down contacts 6, 7 and 8 from the fixed contacts 9', while the up contacts 6, 7 and 8 are held in contact with'the fixed contacts 9, or the support 4 therefor.

The movable contacts 6, 7, 8, etc., are connected as hereinafter described "to car signal means in the corresponding elevator car 1. Said signal means preferably comprises a telephone transmitter 25 and a visual signal or other signal device 26, which may comprise a high resistance electromagnet operating a target signal 27 I Atransfer key or push button 28 is also preferably provided in the car for disabling the resetting circuit, so as to transfer the call to another car.

- landings in advance of the car.

The fixed contacts 9 and 9 of the switch are connected respectively to call or signal devices at the respective landings. At each landing is provided a calling and receiving set, comprising a calling push button 30, for closing a calling circuit, a receiver 31', preferably telephonic, and electric circuit means whereby the calling and telephonic receiving connections may be made over the same circuit, with selective control of the said circuits by the said push buttons and by the car-operated switch, so that connection will be made to one or more calling The push button may operate on an arm 32 of an armature lever 33, which is normally held away from its back contact 34 by residual action of electromagnet 35; the armature 33 being for example made of steel which is polarized by energization of electromagnet 35 and is retained in contact with the electromagnet by such polarization, after the magnet is deenergized, until it is forcibly separated therefrom by the action of push button 30. Push button 30 is provided with a spring 36 which normally holds it away from the arm 32 of the armature lever, so as to leave the armature free for attraction to its electromagnet. Magnet 35 is wound for high inductance so as to act as a retardation or choke coil as hereinafter described.

The telephonic receiver 31 is preferably a loud-talking instrument capable of announcing telephonic messages with sufficient loudness to enable such messages to be heard at a considerable distance, for example throughout the portion of the corridor or hallway which is to be served by the elevator cars.

The circuit connections are as follows: A battery 38 or other suitable source of current, is connected at opposite sides to wires 40 and 41. lVire 40 is connected to the sus pension springs 11 of all the switches there being one of these switches for each elevator shaft. The spring 11 for each switch. is connected by wire 44 leading through the signal cable 15 to the elevator car corresponding to that switch, and is there connected to one side of the transmitter 25 and to one side of the signal device 26, the other side of the transmitter and of the signal device being connected to wire 45 leading back through the signal cable 15 to the switch member 2. where it is connected to all of the contacts 6, 7, and 6', 7'. The fixed contacts 9 are connected respectively, by wires 46 to the wires 47 leading to the respective up call sets at the respective landings. Each of these call sets includes two branch connections 48 and 49, connected in parallel between the wire 47 and a wire leading-to a common return wire 51, which is connected to the wire 41 leading to the other side of the battery. The

connection 48 includes the telephone receiver 31 and a condenser 52. The connection 49 includes the high inductance elec tromagnet or coil 35. Both of these branch connections are contr lled by the armature 33 of said electromagnet the connection 48 leading fron telephone 31 to said armature and the connection 49 leading from the electromagnet coil 35 to said armature, and the back contact 34 of said armature being connected to the wire 50 leading to the common return wire 51. Similar circuit connections 46, 47 lead from the contacts 9 of the switch to the respective call. sets for down calls at the respective landings, from which wires 50 lead to the common return wire 51. The up contacts 9 for all the switches for any number of elevators are connected in multiple by the wires 46 to the same set of up call leads 47, and the down contacts of all the switches are connected by wires 46 in multiple to a single set of down-call leads 47. A resetting circuit connection 53 leads from wire 44 in each car through the transfer key 28 and back through the signal cable to contacts 8 and 8 on the switch member 2, which are adapted to cooperate with projections or lateral extensions 54, 54 on the respective fixed contacts 9 and 9.

The operation is as follows: Assuming that the car at the left, for example, is ascending, the switch member 2 therefor, will be swung over to bring the contacts 6 and 7 against the contacts 9. and as the car ascends, these contacts 6 and 7 will ride on the contacts 9, the position of the contacts 6 and 7 on member 2 being such that contact 7 is riding over a contact 9 corresponding to the next floor in advance, and contact 6 is riding over a contact 9 corresponding to the second floor in advance-of the car. Just as the car leaves any floor. the contact 8 rides over the fixed resetting con tact projection 54. If now one of the push buttons 30 be operated, for example that for the fifth floor, as shown in Fig. 4, the corresponding armature 33 will be forced down into contact with its back contact and will remain there, the magnetization due to polarization of its armature being insufficient to lift it from such position. This closes the call connection. as far as the landing control is concerned, but the connection is not fully completed until the car reaches the proper position in the shaft for the operator to receive the call. say the second floor below the calling floor. at which time the upper contact 6 on the member 2 rides on to the contact 9 which is in connection with the calling push button, a d circuit is then closed as follows: from battery 38 through wire 40 to spring 11, through wire 44 in the signal cable 15 to the elevator car, where it passes in multiple through the transmitter 25 and the signal device 26, to wire 45; then back through signal cable 15 to contact 6 on the switch member 2; then through contact 9, wire 46, wire 47 to call set at the calling landing; the current passing through the branch connection 48 of said call set including the electromagnet or coil 35, armature 33 and contact 34 to wire 50, return wire 51, and back to battery by wire 41. This current being direct, does not pass through the condenser 52, so that the transmitter is not included in this calling circuit, and the resistance of transmitter 25 and signal device 26 in the car is such that the current passing as described is not suiiicient to cause electromagnet 35 to lift armature 33 so that the circuit remains closed, until it is opened by the car-operated switch. The only effect of this direct current is to energize the call device 26, giving a signal to the operator for an up call and to furnish current to the transmitter 25, so that it is in condition for sending of a signal by the operator. The operator will then call into the transmitter the proper announcing signal, for example Number one up, and the pulsating or alternating current thereby set up in the circuit leading through the transmitter will be transmitted through the signal cable 15, by the circuit just traced to the call set at the calling landing. On reaching this call set this pulsating current, or the. variable component thereof, will .be transmitted through the connection 48, including the condenser 52 and the telephone 31, but will not pass through the branch 49 on account of the high inductance of coil 35, which at this time acts as a retardation coil, confining the telephonic current to the receiver branch 48. The receiver announces the signal or announcement given by the operator so that the passenger is notified which one of the elevators will stop for him. He receives this information without having to watch for landing lights or other signals, and in a manner that requires no instruction as to the meaning of the signal. As the car continues to ascend, thebrush 7 rides on to the contact 9 connected to the same call set for the calling landing, the car being then one floor below the calling landing, and the connection is thereby continued in the same manner as above described, the brushes 6 and 7 acting to continue the connection through two floors, and the oper ator may repeat the announcement to the same calling station, as the transmitter .25 is still energized by connection through contact 7 As the car is leaving the floor which has called, brush 7 moves out of contact with corresponding contact 9, and the resetting contact 8 rides on the contact projection 54, the connection proceeding from battery wire 40 connected through spring 11 to the wire 44, through transfer key 28 and Wire 53 to contact 8, and contact ()4, and then to the call device at the landing as before. The current passing through the circuit thus made is increased, on account of the direct connection, independent of the transmitter and high resistance signal device 26, and the electromagnet 35 is adapted to respond to this increased current to lift its armature 33 and open the circuit at 34; the inertia of the armature and its connected parts being such that when the up ward movement is started by the action of the electromagnet, it continues so as to bring the armature against the core of electromagnet and enable it to be retained in such position by the residual magnetism and the polarization of the armature.

If, on account of the car being loaded, for example, the operator cannot take on the passenger, he may announce through the transmitter and the telephonic communications above described Take car number two, or whatever other car which may be next to receive the signal, and he may at the same time by depressing transfer key 28 in the car, open the low resistance connection so that the electroma'gnet 35 is not energized sufficiently to raise its armature 33, as the car passes the calling landing, and the call is retained for the next car. As the car continues to ascend, it eventually causes the arm 21 of the switch member to ride of" of the rail 22, as indicated in dotted lines in Fig. 2 and the springs 18 and 19 then bring the switch member 2 to neutral positicn, wherein contacts 6, '7 and S are brought into riding engagement with the down contacts 9. As shown forithe switch at the right hand side of Fig. 4, the up-contacts 6 and 7 have, at this time ridden past the rip-contacts 9, this position being reached when the car is passing to the top. door from the next floor below. Thus the car is put in communication with the down contacts connected to the down call sets at the landings, while it is still on the up-run, thereby enabling the operator to receive a down call, and to answer the same, before he has reached the top of the shaft. This is of great advantage, since a call received afterthe' operator has begun to descend does not give the operator time to properly respond to it or serve the passenger.

In case two or more call sets for a given direction, for example, up call sets, are provided at any landing, the circuits may be arranged as indicated for the second floor in Fig. 4. so that the circuit closers 33 are connected in multiple by wires 56, 57, 53 to the two telephone receiver sets, so that closure of either circuit closer will enable both telephones to announce simultaneously; or, as shown in Fig. 6, the two circuit closers may connect the telephonic devices in independent connections 59, 60, so that closure of either circuit closer will put only the associated telephone in operative connection, and the announcement will be received only adjacent to the calling push button.

If there is a difference in the height of the floors to be served, then in setting up the apparatus, the weighting means 16 on the signal cable 15 are placed in such positions that the weight brought on the switch supporting spring 11 varies in such man nor that the switch will travel the same distance for each floor. Thus the length of the contacts on the switch may be made uni form and the travel of the switch may be made correspondingly uniform, the compensating weights 16 being shifted according to the particular conditions of the building. In some cases I may prefer to use a variable counterbalance means, as shown in Figs. 7 and S, a cable 62 being connected to the switch and passing up over a sheave 63 and down to a set of pick-up weights 64, which are so connected by means 65 that they will be picked up successively as the switch slide 3 descends. \Vith this construction the weight of the cable is made more than suflicient to produce the proper travel of the switch, and each weight is just sufiicient to add the proper weight to the counterbalance at each floor to cause a uniform travel of the switch for each floor. Thus for a floor of greater height, the counterweight picked up will be relatively heavy, so as to counterbalance a greater part of the cable and allow the car to travel farther for a given travel of the switch. By varying the counterweights 64:, the travel may be varied as required for difference in the heights of the floors.

Anv flexible weight means may be used for actuating the caroperated switch. Thus instead of using the signal cable, an extra cable, chain or other flexible means may be used, as indicated at 66 in Fig. 9.

That I claim is:

1. In an elevator signal, telephone receivers at different landings, a telephone transmitter in the car, and means controlled by the movement of the car for putting the said transmitter in communication successively with different receivers.

In an elevator signal, telephone receivers at different landings, a telephone transmitter in the elevator car, and means controlled by the movement of the car for putting the transmitter in connection with a receiver at a landing in advance of the car.

3. In an elevator signal, telephone receivers at diiferent landings, circuit closing devices at said landings, a transmitter in an elevator car, and circuit means selectively controlled by the said circuit closing devices to put the transmitter in connection with a transmitter at the landing for which a circuit closer is closed.

l. In an elevator signal, telephone receivers and circuit closers at the landings at which stops are to be made, a transmitter on an elevator car, a switch controlled by-the movement of the car, and circuit connections controlled selectively by said circuit closers and by said switch to put the transmitter in connection with the receiver at a landing in advance of the car, for which the circuit closer is closed.

5. In an elevator signal, a car provided with a telephonic transmitter and with a signal device, call devices at different land ings provided with telephonic receivers and wi h circuit closers, and circuit connections including said telephonic and signal devices in the car and the landings and comprising a single pair of leads for both telephonic and signaling communications between the car and the landing.

6. In an elevator signal, a car provided with a telephonic transmitter and with a signal device, a call device at each landing comprising a circuit closer, a telephonic receiver and reactive device, a source of direct current, connections therefrom through the circuit closer and reaction device for each landing to the said signal device, to

operate the signal device by direct current, and a shunt connection around the reactive device including said telephonic receiver and a condenser, for operation of said receiver by telephonic current.

7. In an elevator signal, a car signal, a landing circuit closer, circuit connections for operating the car signal when the landing circuit closer is closed, an electromag netic device included in said circuit connection for opening said circuit closer, the resistance of said circuit connections, including the car signal, being such as to reduce the signal operating current so as to preventoperation of said electromagnetic device, and means operated by the movement of the car for shortcircuiting a portion of said resistance, so as to increase the current and cause operation of said electromagnetic device to open the circuit closer.

8. In an elevator signal, a circuit closer at a landing, signal circuit connections controlled thereby and including an electromagnetic device for opening the circuit closer, means controlled by the movement of the car for sending a signaling current there through, insullicient to operate said electromagnetic device, and for subsequently sending an increased current therethrough for operating the electromagnetic device to open the circuit closer.

9. In an elevator signal, a manually operated circuit closer, signal circuit connections controlled by said circuit closer, and including means for transmitting a signaling current and an increased current for resetting, and means responsive to said increased resetting current for opening the circuit closer.

10. In an elevator signal, a circuit closer, comprising an armature, an'electromagnet actuating said armature to open the circuit closer and adapted to normally hold the armature in open position by residual eiii'ect atterthe circuit of aid electroinagnet is brolr en,a push button for moving said circuit closer to closed position, signal circuit connections including said elect romagnet, and a car signal device adapted for oper tion by current through said circuit connecticns without operating said armature, said electromagnet being adapted, when energized by an increased current, to operate said armature to move the circuit closer to open position, and car-operated means for first closing circuit through said circuit connections for sending signal current when the circuit closer is closed, and for thereafter sending an increased current for resetting said circuitcloser.

IlfIn an elevator signal, a landing circuitcloser, a car signal comprising high resistance nieans, an electromagnet for opening the circuit closer, means operated by the motion of the car for closing a signal connection through said electromagnet and the high resistance signal means at the car, and 'for subsequently closing a connection through said electromagnet exclusive of said high resistance signal means. I

12. In an elevator signal, the combination of signal devices at different landings, comprising up signal device and a down signal device at each landing, a car-operated switch provided with contacts for establishingsignaling connection from the car to an upsignal device in advance of the car when'the car is ascending, and to a down signal device in advance of the car when the'car is descending, means for reversing the position of said switch after it has reversed its direction of travel, and means controlled by the switch as it approaches eachend of its travel, to make controlling connection to a landing signal device for the opposite direction of travel.

13. In an elevator signal, the combination 01" up and down call devices at the landings, a cai'operated switch comprising fixed up and down contacts andr'a member provided with movable contacts and mounted to move in correspondence with the car and also mounted to move to bring its contacts into cooperative relation with either the up contact or the down contacts of the switch, and means'acting on said switch member as the car approaches its limit of travel, to move it to position for cooperation with the contacts corresponding to the opposite direction of travel.

' 1%. In an elevator signal, a plurality of telephone transmitters in different cars, a

plurality of telephone receivers at difierent landings, and car-operated means for putting each of said transmitters in communication with a receiver at a landing in advance of the car.

15. In an elevator signal, a landing circuit closer, resetting means therefor, a car signal, circuit connections for controlling said car signal from said circuit closer, call transmitting means in the car, call receiving means at diii'erent landings connected to said call transmitting means through the aforesaid circuit connections, a car-operated switch and circuit connections controlled thereby for controlling said resetting means, and means including a circuit breaker in the car, connected to the aforesaid circuit connections for the signal and to the circuit connections controlled by the car operated switch for controlling the last named circuit connections to prevent resetting of the circuit closers.

i '16. In an elevator signal, the combination of call devices: at the landings, a switch controllingthe connections to the respective call devices, andmeans for operating said switch in correspondence with the movement of the car, comprising a flexible member suspended from the car and from the switch and adapted to operate the switch in one direction by the weight of the said memher, and means operating on said switch to yieldingly resist the action of such weight.

In an elevator signal, a car-operated switchcomprising a switch slide mounted to travel vertically, a cable suspended from the car and from said switch slide, and a spring I suspending said switch slide to sustain the same in opposition to the weight of, the cable.

18. In an elevator signal, a car-operated switch comprising a switch slide mounted to travel vertically, a spring suspending said slide, a cable suspended from the car and from the switch slide, to operate the, switch slide by the weight of said cable, a switch member swingingly mounted on said switch slide, contacts mounted at opposite sides of the switch member, fixed contacts adapted to cooperate respectively with said contacts on the switch member, a reversing rail extending adjacent to said switch member, and means on the switch member for engaging the reversing rail to swing the switch memher when the switch slide reverses its travel.

19. In an elevator signal, a plurality of call receiving devices at a landing, a car 'provided with a call transmitter, and cirtransmitter to the plurality of call receiving devices at said landing, and circuit closers adjacent the respective receiving devices for controlling said circuit connections.

21. In an elevator signal, a signal controlling switch connected for operation by the movement of the elevator car, and means controlled by the movement of said switch for varying the travel of the said switch relatively to the travel of the car to maintain a uniform travel of the switch for floors of different height.

22. In an elevator signal, a movably mounted switch, a cable connected to said switch and to an elevator car to operate said switch by the weight of the cable, means for yieldingly resisting the movement of the switch, and variable weight means acting on said switch to vary the travel of the switch relatively to the travel of the car.

23. In an elevator signal, a plurality of call transmitters in difierent cars, a call receiver at a landing, a circuit closer at said landing, a car operated switch, and circuit connections controlled by said circuit closer and said car operated switch for maintaining circuit connection to said receiver from the transmitter in any car which is approaching said landing, said receiver being adapted to receive calls during all the time connection is maintained thereto.

24. In an elevator signal, a plurality of call transmitters in dillerent cars, a call receiver at a landing, a car operated switch, and circuit connections controlled by said car operated switch for maintaining circuit connection to said call receiver from said call transmitter in any car which is approaching said landing, said call receiver being adapted to receive calls during all the time connection is maintained thereto.

In testimony whereof I have hereunto set my hand, at Los Angeles, California, this 2nd day of March 1915.

ROBERT H. GAYLORD.

\Vitnesses:

A. P. KNIGHT, C. E. ALLYN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. O. 

